Improvement in cylinder-cocks



M. B. MASON &. J. s McCRUM. I Improvement in Cylinder Cocks.

Patented Oct. 17,1871.

Hllll lilllll Fig. 1.

m fiwwww/mgw INVENTORS I UNITED S'rA'rEs Parana Qrrrcn MATTHEW B. MASON AND JOHN S. MCORUM; OF KANSAS CITY, MISSOURI.

IMPROVEMENT IN CYLINDER-COCKS.

Specification forming part of Letters Patent N 0. 120,080, dated October 17, 1871.

To all whom it may concern:

Be it known that we, MATTHEW B. MASON and JOHN S. MGGRUM, both of Kansas City, Jackson count Missouri, have invented an Improved Oylinder-Oock, of which the following is a specification:

Our invention relates to that class of devices which is employed for discharging the Water of condensation from the cylinders of locomotive and other steam-engines; and our improvement consists in providing such devices with a poppetvalve, whose stem is operated in such a manner as to open said valve, by means of a bolt-crank, so as to allow the water to escape through a side or branch pipe a suitable bridge or stop being provided in the barrel of the cock to limit the movement of the valve when lifted from its seat by the above-mentioned bell-crank.

Figure 1 is an axial section of a cylinder-cock embodying our improvements, the valve being shown as partially opened. Fig. 2 is a transverse section of the barrel at the line X X, is an elevation of the head-of the device.

The principal member of the cock consists of a barrel, A, having a diminished portion or neck,

B, the latter being screw-threaded at b, so as to engage either with the cylinder or cylinder-head. The enlarged end of this barrel has a screw-thread, a, with which is engaged a head, 0, that is fur nished with a valve-seat, c, a chamber, D, and an axial bore, (1, which bore is coincident with the bore L of the neck. Traversin g the bore dis the stem E of a spindle or poppet-valve, F, whose face f is ground so as to fit accurately the seat 0, and said valve is furnished with wings that play within the chamber D. The valve is operated by a bell-crank, G, which is pivoted at h to a bracket or support, H, that projects from the head 0. ScrewedintotheheadGisaside orbranch pipe,I, through which the water of condensation is discharged whenever the valve F is lifted from off its seat. Placed athwart the barrel A is a stop or bridge, J, which serves to limit the upward or opening movement of the valve. The bell-crank G is operated by arod, K, which should extend back into the engineers cab whenever and Fig. 3

the cock is applied to the cylinder of a locomotive.

In its normal or closed position the valve F rests upon the seat 0 and is maintained securely in contact therewith by the pressure of steam in the cylinder, and whenever it is desired to discharge the water of condensation from the steamcylinder the engineer has only to pull the rod K when the bell-crank G will open the valve F and allow the water to be ejected through branch pipe I. As soon as the Water has been discharged the engineer quits his hold of rod K and the pressure of the steam immediately restores the valve to its normal or closed condition.

If at any time the valve should need regrinding it can be detached from the cock by simply unscrewing the head 0, which is the work of but a few .moments.

In the drawing the branch pipe I is shown as being situated in the same vertical plane as the bell-crank G but it is evident that said pipe may be attached to the head in such a manner as to incline to the right or left, as shown by dotted lines in Fig. 3.

In case steam should be suddenly shutoff when the engine is running at a high speed a vacuum would be produced in a cylinder provided with an ordinary plug-valve; but, under similar circumstances, our valve would instantly open, and, by admitting air at every stroke of the piston, destroy the vacuum, and thereby prevent the injurious cutting of the packing. This valve being besides much cheaper than the ordinary plugcock, is also muchmore durable andwill discharge the water of condensation more promptly.

We claim as our invention- The combination, substantially as described,

of the barrel A b L, detachable head 0 c d, valve E F f, support H, ridge or stop J, and operating bell-crank G, for the object stated.

In testimony of which invention we hereimto set our hands.

MATTHEW B. MASON. Witnesses: JOHN S. McGRUM.

GEo. H. KNIGHT, JOHN Kmon. 

